Consider these reactions, where M represents a generic metal. 1.2 M(s) + 6 HCl(aq) 2 MCI, (aq) + 3H2(g) AH = -849.0 kJ 2. HCl(g) HCl(aq) AH2 = -74.8 kJ 3. H,(g) + Cl (9) 2 HCl(g) AH3 = -1845.0 kJ 4. MCI,() MCI, (aq) AH4 = -387.0 kJ Use the information to determine the enthalpy of the reaction. - 2 M(s) + 3 CI,(g) 2 MCI,(s) AH ? STRATEGY 1. Identify how each equation should be manipulated. 2. Calculate the new individual enthalpies. 3. Calculate the overall enthalpy by adding the individual enthalpies. Step 1: Equations 1-4 can be summed to get the overall reaction, but there are some manipulations that have to occur first, such as reversing an equation, or multiplying it by a factor. Identify how each equation should be used by filling out the table. Use the information to determine the enthalpy of the reaction. 2 M(s) + 3Cl2(g) 2 MCI,(s) AH =? STRATEGY 1. Identify how each equation should be manipulated. 2. Calculate the new individual enthalpies. 3. Calculate the overall enthalpy by adding the individual enthalpies. Step 1: Equations 1-4 can be summed to get the overall reaction, but there are some manipulations that have to occur first, suc reversing an equation, or multiplying it by a factor. Identify how each equation should be used by filling out the table. Direction Factor Answer Bank Equation 1 2 3 1 forward forward 3 2 6 forward forward 4 Overse forward 2